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3 Unlabeled Buttons

The Optiplex 3240 / 7440 / 5250 / 7450 All in One (AIO) systems have 3 unlabeled buttons on the lower right edge. The functions of these 3 buttons may confuse users and cause them to contact Dell support.

The top and middle buttons adjust the brightness of the display. While the bottom will turn the display off while leaving the system powered on. (Figure 1)

Note: The 7440 bottom button can also switch to HDMI video input. The HDMI input is only available on systems configured with the full HD LCD Screen. Systems with the 4k2k LCD screen do not come with the HDMI input connection.

The 7450 requires the On Screen Display (OSD) application that is available on the Dell Support Site

Figure 1

Green - Increases brightness.

Yellow - Decreases brightness.

Red - Turns display off.

Troubleshooting

To troubleshoot this issue, users should first press the bottom button to see if the display powers on again.

Note: Users may also try to press any key on the keyboard, move the mouse, or touch the screen to power up the display.

Users may also disable these side buttons in the BIOS. In the BIOS, under the System Configuration option. OSD Button Management should be listed with the option to disable.